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    <h1 class="post-title">小程序之登录</h1>

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        <h2 id="一、登录流程"><a href="#一、登录流程" class="headerlink" title="一、登录流程"></a>一、登录流程</h2><p><img src="https://poetries1.gitee.io/img-repo/2019/10/662.png" alt></p>
<ul>
<li>小程序内通过<code>wx.login</code>接口获得<code>code</code></li>
<li>将<code>code</code>传入后台，后台对微信服务器发起一个<code>https</code>请求换取<code>openid</code>、<code>session_key</code>(解密<code>encryptedData</code>、<code>iv</code>得到的)</li>
<li>后台生成一个自身的<code>3rd_session</code>（以此为<code>key</code>值保持<code>openid</code>和<code>session_key</code>），返回给前端。PS:微信方的<code>openid</code>和<code>session_key</code>并没有发回给前端小程序 </li>
<li>小程序拿到<code>3rd_session</code>之后保持在本地</li>
<li>小程序请求登录区内接口，通过<code>wx.checkSession</code>检查登录态，如果失效重新走上述登录流程，否则待上<code>3rd_session</code>到后台进行登录验证</li>
</ul>
<blockquote>
<p>通过上面<code>wx.login</code>和<code>wx.getUserInfo</code>两个api拿到相应的信息,并通过上方接口传给自己的服务器. </p>
</blockquote>
<p><strong>登录获取用户信息</strong></p>
<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line">wx.login(&#123;</span><br><span class="line">    success(res)&#123;</span><br><span class="line">     <span class="built_in">console</span>.log(res)</span><br><span class="line">       <span class="comment">//code:"fda41033Z0fdak3dfae01dffaaWXQA1vwQ4dfae0Akg3e0Z0k3E"</span></span><br><span class="line">       <span class="comment">//errMsg:"login:ok"</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line">wx.getUserInfo(&#123;</span><br><span class="line">   success(res)&#123;</span><br><span class="line">     <span class="built_in">console</span>.log(res)</span><br><span class="line">   &#125;</span><br><span class="line"> &#125;)</span><br></pre></td></tr></table></figure>
<p>返回的信息</p>
<p><img src="https://poetries1.gitee.io/img-repo/2019/10/663.png" alt></p>
<p><strong>需要传输的信息有7个参数</strong></p>
<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line">appid  小程序唯一标识</span><br><span class="line">secret  小程序的 app secret</span><br><span class="line">js_code  <span class="comment">//wx.login登录时获取的 code,用于后续获取session_key</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//下面两个参数用户服务器端签名校验用户信息的</span></span><br><span class="line">signature 使用 sha1( rawData + sessionkey ) 得到字符串，用于校验用户信息。</span><br><span class="line">rawData  不包括敏感信息的原始数据字符串，用于计算签名。</span><br><span class="line"></span><br><span class="line"><span class="comment">//下面两个参数是用于解密获取openId和UnionId的</span></span><br><span class="line">encryptedData  包括敏感数据在内的完整用户信息的加密数据</span><br><span class="line">iv 加密算法的初始向量</span><br></pre></td></tr></table></figure>
<ul>
<li>可精简为以下三个参数. </li>
<li>其余的签名校验的参数可省略,而<code>appid</code>和<code>secret</code>可以直接写在服务器.</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line">js_code <span class="comment">//  wx.login登录时获取的 code,用于后续获取session_key</span></span><br><span class="line">encryptedData  包括敏感数据在内的完整用户信息的加密数据</span><br><span class="line">iv 加密算法的初始向量</span><br></pre></td></tr></table></figure>
<blockquote>
<p>服务端处理返回token、sessionId过程省略…</p>
</blockquote>
<h2 id="二、登录态校验"><a href="#二、登录态校验" class="headerlink" title="二、登录态校验"></a>二、登录态校验</h2><blockquote>
<p>主要用到<code>checkSession</code></p>
</blockquote>
<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line">wx.checkSession(&#123;</span><br><span class="line">    success: <span class="function">(<span class="params">res</span>) =&gt;</span> &#123;</span><br><span class="line">        <span class="built_in">console</span>.log(<span class="string">'warning wx.checkSession OK, but no viewerId'</span>, res);</span><br><span class="line">    &#125;,</span><br><span class="line">    fail: <span class="function">(<span class="params">res</span>) =&gt;</span> &#123;</span><br><span class="line">        <span class="built_in">console</span>.log(<span class="string">'wx.checkSession failed:'</span>, res);</span><br><span class="line">    &#125;,</span><br><span class="line">    complete: <span class="function"><span class="params">()</span> =&gt;</span> &#123;</span><br><span class="line">        wx.login(&#123;</span><br><span class="line">            success: <span class="function">(<span class="params">res</span>) =&gt;</span> &#123;</span><br><span class="line">                <span class="built_in">console</span>.log(<span class="string">'wx.login success:'</span>, res);</span><br><span class="line">                <span class="comment">// 登录自有系统</span></span><br><span class="line">                API.login.wechat(&#123;</span><br><span class="line">                    js_code: res.code</span><br><span class="line">                &#125;, d =&gt; &#123;</span><br><span class="line">                    <span class="built_in">console</span>.log(<span class="string">'private login response:'</span>, d);</span><br><span class="line">                    <span class="keyword">if</span> (d.code === <span class="number">0</span>) &#123;</span><br><span class="line">                        <span class="built_in">console</span>.log(<span class="string">'private login success:'</span>, d);</span><br><span class="line"></span><br><span class="line">                        <span class="keyword">let</span> viewerId = d.data.user.user_id;</span><br><span class="line">                        _m.globalData.viewerId = viewerId;</span><br><span class="line"></span><br><span class="line">                        wx.setStorageSync(<span class="string">'user_id'</span>, viewerId);</span><br><span class="line"></span><br><span class="line">                        callback &amp;&amp; callback();</span><br><span class="line">                    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                        <span class="built_in">console</span>.error(<span class="string">'get user_id error'</span>);</span><br><span class="line">                    &#125;</span><br><span class="line">                &#125;, &#123;</span><br><span class="line">                    ignoreError: <span class="literal">true</span></span><br><span class="line">                &#125;);</span><br><span class="line">            &#125;,</span><br><span class="line">            fail: <span class="function">(<span class="params">res</span>) =&gt;</span> &#123;</span><br><span class="line">                <span class="built_in">console</span>.log(<span class="string">'wx.login failed:'</span>, res);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;);</span><br></pre></td></tr></table></figure>
<h2 id="三、完整登录代码示例"><a href="#三、完整登录代码示例" class="headerlink" title="三、完整登录代码示例"></a>三、完整登录代码示例</h2><figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"><span class="keyword">const</span> CONFIG = <span class="built_in">require</span>(<span class="string">'./config.js'</span>)</span><br><span class="line">App(&#123;</span><br><span class="line">    globalData:&#123;</span><br><span class="line">        viewerId:<span class="literal">null</span>,</span><br><span class="line">        userInfo:<span class="literal">null</span></span><br><span class="line">    &#125;,</span><br><span class="line">    onLaunch()&#123;</span><br><span class="line">        <span class="comment">// 注册当前用户</span></span><br><span class="line">        <span class="keyword">this</span>.register()</span><br><span class="line">    &#125;,</span><br><span class="line">    login: <span class="function"><span class="keyword">function</span>(<span class="params">callback</span>) </span>&#123;</span><br><span class="line">        <span class="keyword">let</span> _m = <span class="keyword">this</span></span><br><span class="line">    </span><br><span class="line">        <span class="comment">// 开发环境重复使用就好</span></span><br><span class="line">        <span class="keyword">if</span> (!viewerId &amp;&amp; CONFIG.IS_DEBUG) &#123;</span><br><span class="line">            viewerId = wx.getStorageSync(<span class="string">'user_id'</span>);		</span><br><span class="line">        &#125;</span><br><span class="line">    </span><br><span class="line">        <span class="comment">// 先检查是否有登录态，且获取过用户数据；否则触发一次登录</span></span><br><span class="line">        <span class="keyword">if</span> (viewerId) &#123;</span><br><span class="line">            _m.globalData.viewerId = viewerId;</span><br><span class="line">            callback &amp;&amp; callback();</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">            wx.checkSession(&#123;</span><br><span class="line">                success: <span class="function">(<span class="params">res</span>) =&gt;</span> &#123;</span><br><span class="line">                    <span class="built_in">console</span>.log(<span class="string">'warning wx.checkSession OK, but no viewerId'</span>, res);</span><br><span class="line">                &#125;,</span><br><span class="line">                fail: <span class="function">(<span class="params">res</span>) =&gt;</span> &#123;</span><br><span class="line">                    <span class="built_in">console</span>.log(<span class="string">'wx.checkSession failed:'</span>, res);</span><br><span class="line">                &#125;,</span><br><span class="line">                complete: <span class="function"><span class="params">()</span> =&gt;</span> &#123;</span><br><span class="line">                    wx.login(&#123;</span><br><span class="line">                        success: <span class="function">(<span class="params">res</span>) =&gt;</span> &#123;</span><br><span class="line">                            <span class="built_in">console</span>.log(<span class="string">'wx.login success:'</span>, res);</span><br><span class="line">                            <span class="comment">// 登录自有系统</span></span><br><span class="line">                            API.login.wechat(&#123;</span><br><span class="line">                                js_code: res.code</span><br><span class="line">                            &#125;, d =&gt; &#123;</span><br><span class="line">                                <span class="built_in">console</span>.log(<span class="string">'private login response:'</span>, d);</span><br><span class="line">                                <span class="keyword">if</span> (d.code === <span class="number">0</span>) &#123;</span><br><span class="line">                                    <span class="built_in">console</span>.log(<span class="string">'private login success:'</span>, d);</span><br><span class="line">    </span><br><span class="line">                                    <span class="keyword">let</span> viewerId = d.data.user.user_id;</span><br><span class="line">                                    _m.globalData.viewerId = viewerId;</span><br><span class="line">    </span><br><span class="line">                                    wx.setStorageSync(<span class="string">'user_id'</span>, viewerId);</span><br><span class="line">    </span><br><span class="line">                                    callback &amp;&amp; callback();</span><br><span class="line">                                &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                                    <span class="built_in">console</span>.error(<span class="string">'get user_id error'</span>);</span><br><span class="line">                                &#125;</span><br><span class="line">                            &#125;, &#123;</span><br><span class="line">                                ignoreError: <span class="literal">true</span></span><br><span class="line">                            &#125;);</span><br><span class="line">                        &#125;,</span><br><span class="line">                        fail: <span class="function">(<span class="params">res</span>) =&gt;</span> &#123;</span><br><span class="line">                            <span class="built_in">console</span>.log(<span class="string">'wx.login failed:'</span>, res);</span><br><span class="line">                        &#125;</span><br><span class="line">                    &#125;);</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;,</span><br><span class="line">    register: <span class="function"><span class="keyword">function</span>(<span class="params">needTry, callback</span>)</span>&#123;</span><br><span class="line">        !callback &amp;&amp; (callback = <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;&#125;);</span><br><span class="line">        </span><br><span class="line">        <span class="keyword">this</span>.login(<span class="function"><span class="params">()</span>=&gt;</span>&#123;</span><br><span class="line">            <span class="comment">// 如果曾经授权过，则不用再请求了</span></span><br><span class="line">            <span class="comment">/*try &#123;</span></span><br><span class="line"><span class="comment">                let registedTime = wx.getStorageSync('REGISTED.'+ this.globalData.viewerId);</span></span><br><span class="line"><span class="comment">                // 7天内授权过的不再请求，不再更新资料</span></span><br><span class="line"><span class="comment">                if (registedTime &amp;&amp; ((new Date).getTime()-registedTime) &lt; 604800000) &#123;</span></span><br><span class="line"><span class="comment">                    callback();</span></span><br><span class="line"><span class="comment">                    return;</span></span><br><span class="line"><span class="comment">                &#125;</span></span><br><span class="line"><span class="comment">            &#125; catch (e) &#123;&#125;*/</span></span><br><span class="line">        </span><br><span class="line">            wx.getUserInfo(&#123;</span><br><span class="line">                success: <span class="function">(<span class="params">res</span>) =&gt;</span> &#123;</span><br><span class="line">                    <span class="keyword">let</span> params = &#123;&#125;;</span><br><span class="line">        </span><br><span class="line">                    <span class="keyword">this</span>.globalData.userInfo = res.userInfo;</span><br><span class="line">                    params.owner = &#123;</span><br><span class="line">                        id: <span class="keyword">this</span>.globalData.viewerId,</span><br><span class="line">        </span><br><span class="line">                        connected_profile: &#123;</span><br><span class="line">                            nickname : res.userInfo.nickName||<span class="string">''</span>,  <span class="comment">// 用户昵称</span></span><br><span class="line">                            profile_pic_url: res.userInfo.avatarUrl||<span class="string">''</span>,  <span class="comment">// 头像， avatarUrl</span></span><br><span class="line">                            language : res.userInfo.language||<span class="string">''</span>,  <span class="comment">// 语言, "zh_TW"</span></span><br><span class="line">                            gender : res.userInfo.gender,</span><br><span class="line">                            geo: &#123;</span><br><span class="line">                                country	: res.userInfo.country,</span><br><span class="line">                                province: res.userInfo.province,</span><br><span class="line">                                city	: res.userInfo.city</span><br><span class="line">                            &#125;</span><br><span class="line">                        &#125;</span><br><span class="line">                    &#125;</span><br><span class="line">                    API.profile.update(params, (d) =&gt; &#123;</span><br><span class="line">                        <span class="comment">// 静默注册</span></span><br><span class="line">                        <span class="keyword">if</span>(d.code === <span class="number">0</span>) &#123;</span><br><span class="line">                            <span class="keyword">try</span> &#123;</span><br><span class="line">                                wx.setStorageSync(<span class="string">'USERINFO.'</span>+ <span class="keyword">this</span>.globalData.viewerId, <span class="keyword">this</span>.globalData.userInfo);</span><br><span class="line">                                wx.setStorageSync(<span class="string">'REGISTED.'</span>+ <span class="keyword">this</span>.globalData.viewerId, (<span class="keyword">new</span> <span class="built_in">Date</span>).getTime());</span><br><span class="line">                            &#125; <span class="keyword">catch</span> (e) &#123;&#125;</span><br><span class="line">        </span><br><span class="line">                            callback();</span><br><span class="line">                        &#125;</span><br><span class="line">                    &#125;, &#123;</span><br><span class="line">                        ignoreError: <span class="literal">true</span></span><br><span class="line">                    &#125;);</span><br><span class="line">                &#125;,</span><br><span class="line">                fail: <span class="function"><span class="params">()</span> =&gt;</span> &#123;</span><br><span class="line">                    <span class="built_in">console</span>.log(<span class="string">'get user info failed: not authorized.'</span>, <span class="built_in">arguments</span>);</span><br><span class="line">                    </span><br><span class="line">                    <span class="comment">// 强制弹一次授权</span></span><br><span class="line">                    <span class="keyword">if</span> (needTry) &#123;</span><br><span class="line">                        wx.openSetting(&#123;</span><br><span class="line">                            success: <span class="function">(<span class="params">res</span>)=&gt;</span> &#123;</span><br><span class="line">                                <span class="keyword">if</span> (res.authSetting[<span class="string">'scope.userInfo'</span>]) &#123;</span><br><span class="line">                                    wx.showToast(&#123;</span><br><span class="line">                                        title: LANG.AuthorizeSuccess,</span><br><span class="line">                                        duration: CONFIG.SHOWTOAST_DURATION,</span><br><span class="line">                                    &#125;);</span><br><span class="line">                                &#125;</span><br><span class="line">                            &#125;,</span><br><span class="line">                            fail: <span class="function">(<span class="params">res</span>)=&gt;</span> &#123;</span><br><span class="line">                                <span class="built_in">console</span>.log(<span class="string">'user not permit to authorize.'</span>, <span class="built_in">arguments</span>);</span><br><span class="line">                            &#125;</span><br><span class="line">                        &#125;);</span><br><span class="line">                    &#125;</span><br><span class="line">                &#125;,</span><br><span class="line">                withCredentials: <span class="literal">false</span>	<span class="comment">// 不包含openid 等敏感信息</span></span><br><span class="line">            &#125;);</span><br><span class="line">        &#125;);</span><br><span class="line">    &#125;,</span><br><span class="line">    init: <span class="function"><span class="keyword">function</span>(<span class="params">callback</span>) </span>&#123;</span><br><span class="line">        <span class="keyword">this</span>.login(<span class="function"><span class="params">()</span>=&gt;</span>&#123;</span><br><span class="line">            <span class="comment">// 塞入常规环境数据</span></span><br><span class="line">            <span class="keyword">let</span> pageInstance = <span class="keyword">this</span>.getCurrentPageInstance(),</span><br><span class="line">                context, screenWidth, screenHeight;</span><br><span class="line"></span><br><span class="line">            <span class="comment">/*if (this.globalData.device.system_info) &#123;</span></span><br><span class="line"><span class="comment">                screenWidth = this.globalData.device.system_info.screen_width;</span></span><br><span class="line"><span class="comment">                screenHeight = this.globalData.device.system_info.screen_height;</span></span><br><span class="line"><span class="comment">            &#125; else &#123;</span></span><br><span class="line"><span class="comment">                let systemInfo = wx.getSystemInfoSync();</span></span><br><span class="line"><span class="comment">                if (systemInfo) &#123;</span></span><br><span class="line"><span class="comment">                    screenWidth = systemInfo.screenWidth;</span></span><br><span class="line"><span class="comment">                    screenHeight = systemInfo.screenHeight;</span></span><br><span class="line"><span class="comment">                &#125;</span></span><br><span class="line"><span class="comment">            &#125;*/</span></span><br><span class="line">            context = &#123;</span><br><span class="line">                LANG				: LANG,</span><br><span class="line">                CDN					: CONFIG.CDN_HOST,</span><br><span class="line">                isNoContent			: <span class="literal">false</span>,</span><br><span class="line">                HashtagType			: CONFIG.HashtagType,</span><br><span class="line">                VerbType			: CONFIG.VerbType,</span><br><span class="line">                GridImageWidthMode	: CONFIG.GridImageWidthMode,</span><br><span class="line">                STICKER_MAKER_ENABLED: CONFIG.STICKER_MAKER_ENABLED,</span><br><span class="line">                UGC_ENABLED			: CONFIG.UGC_ENABLED,</span><br><span class="line">                UGC_IMAGE_COUNT_LIMIT: CONFIG.UGC_IMAGE_COUNT_LIMIT,</span><br><span class="line">                ReviewStateText		: CONFIG.ReviewStateText,</span><br><span class="line"></span><br><span class="line">                networkType			: <span class="keyword">this</span>.globalData.device.network ? <span class="keyword">this</span>.globalData.device.network.network_type : NetworkType.UNKNOWN,</span><br><span class="line"></span><br><span class="line">                IS_DEV				: CONFIG.IS_DEV,</span><br><span class="line">                IS_SHOW_CONSOLE		: CONFIG.IS_SHOW_CONSOLE,</span><br><span class="line">                DEBUG_DATA			: [],</span><br><span class="line"></span><br><span class="line">                <span class="comment">// 全部配置都放开读</span></span><br><span class="line">                CONFIG				: CONFIG,</span><br><span class="line"></span><br><span class="line">                videoPlayStatus		: &#123;&#125;,</span><br><span class="line">                </span><br><span class="line">                CURRENT_PAGE		: pageInstance.data.PAGE,</span><br><span class="line"></span><br><span class="line">                hideVideo			: <span class="literal">false</span>,  <span class="comment">// 因为小程序中video不能被任何元素遮挡，所以增加此变量，用于一些浮层展示时，隐藏视频</span></span><br><span class="line">                </span><br><span class="line">                updated_time		: (<span class="keyword">new</span> <span class="built_in">Date</span>).getTime()  <span class="comment">// 页面上次更新时间</span></span><br><span class="line">            &#125;;</span><br><span class="line"></span><br><span class="line">            pageInstance.setData(&#123;</span><br><span class="line">                context: context</span><br><span class="line">            &#125;);</span><br><span class="line"></span><br><span class="line">            <span class="keyword">this</span>.sendLaunchEvent();</span><br><span class="line"></span><br><span class="line">            callback &amp;&amp; callback();</span><br><span class="line">        &#125;)</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>

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